Da-som coincidently finds Do-Hoon's old ID on the floor. She later returns it to him asking some questions. Do-Hoon then decides to tell her about his painful past, and so she feels guilty about asking questions and hugs him. MC uses this situation to invoke jealousy into Mrs. Lee Sohee. The latter leaves them all alone for a work meeting & the work mates don't waste any time and they get straight to fucking.
Do-hoon is more motivated than ever to take revenge. So, he set his eyes on completely taming his bully's mother (Lee Sohee). In a dark office room at night at their workplace, Do-hoon promises that It'd be their last night together, so he goes hardcore on his boss by putting her on a leash and enjoying a steamy night taming her and turning her into his bitch.